Before a transistor can amplify, it must be biased. Set the resistor network and watch the operating point land on the load line — in the active region, or clipped into saturation.
BJT Transistor BiasLive
voltage-divider Q-point
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Voltage-divider bias sets a transistor's operating point (Q-point) stably against variations in β. The base voltage fixes the emitter current, and the collector-emitter voltage falls on the DC load line. For a clean amplifier, the Q-point should sit near the middle of the active region.
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How it works
Voltage-divider bias fixes a bipolar transistor's operating point (Q-point) so it stays stable despite variations in current gain β. The base network sets the emitter current, and the collector-emitter voltage falls on the DC load line. A well-designed amplifier places the Q-point near mid-line, giving maximum symmetric swing before clipping.
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